System of electrical operation.



PATENTED JULY 2, 1907.

J. c. SLAUGHTER. SYSTEM OF ELECTRICAL OPERATION.

APPLIOATION FILED MAR.12.1903.

11-: mmms PETERS ca., WASHINGTON, n c.

UNITED STATES PATENT OFFICE.

.IOEL C. SLAUGHTER, OF DALLAS, TEXAS, ASSIGNOR TO ELECTRICAUTO-TEANSFORMER COMPANY, A CORPORATION OF MISSOURI.

SYSTEM OF ELECTRICAL OPERATION.

Specification of Letters Patent.

Patented July 2, 1907.

Application filed MitTOll 12,1903 SBIlELl NO. 147,380.

To all whom it may concern:

Be it known that I, JOEL O. SLAUGHTER, a citizen of the United States,residing at Dallas, Dallas county, State of Texas, have invented certainnew and useful Improvements in Systems of Electrical Operation, of whichthe following is a specification containing a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart hereof.

The drawing is a diagrammatic view of an alternating current generatorsystem for carrying out my invention.

This invention relates to systems of electrical operation and is adaptedto be utilized particularly in corr- 'nection with alternating currents.

The object of my invention is to provide a system wherein a saving willbe effected in the power required to operate a generator during reducedloads, thereby reducing the fuel consumption below that which would berequired to operate the systems in use at present.

In the present systems, wherein a constant voltage is maintained, themagnetic losses in the generator when operating under a reduced load,are practically the same as when it is supplying its entire capacity. Inmy improved system, I decrease the excitation of the generator duringreduced loads, and thereby reduce the energy wasted through magneticreactions. Decreasing the excitation will also reduce the voltage supplyof said generator. To maintain the voltage at the desired value, Iadjust the output of a voltage raising device in the generator circuit.

Referring to the drawing, 1 indicates an alternating current generator,2 and 3 the main lines leading from the same. 4 indicates the generatorexciter, 5 and 6 indicate wires connecting the exciter 4 to thealternator field. When the wire 5 is connected to the positive brush ofthe exciter the current will pass from the exciter 4 through the wire 5,through the switch 7, into the rheostat 8, thence to the field of thealternator and return to the exciter through the wire 6.

9 indicates the primary coil of a transformer, this coil is ofadjustable value and connected in series on the main line wire 3. 10indicates the secondary coil which is preferably wound on the same corein close proximity to the primary, one end of this secondary coil isconnected to the wire 3 at 12, the other end of said coil beingconnected to the 'wire 2 by means of a switch 11.

A switch 13 is connected at one end to the main line wire 3, the otherend of said switch being adapted to engage any one of a series ofcontacts 14, connected to different points in the primary coil 9. I haveherein shown a connection between the switches 7 and 13 to cause them tooperate simultaneously.

The operation of my. improved system is as follows:

When the generator is supplying its entire capacity, the switch 7engages the rheostat contact at the extreme left, thereby removing theresistance of the rheostat 8 from the exciter circuit, the switch 13engages the contact 14 at the extreme right, thus permitting the entiregenerator supply to be delivered to the translating devices withoutgoing through the adjustable primary coil 9, and if desired, the switch11 may be open. When the generator is operating under reduced loads, theswitch 11 is closed. The switches 7 and 13 are adjusted simultaneouslyto decrease the Iield excitation and maintain a predetermined voltage inthe generator circuit, 'L'. c. the switch 7 is adjusted to introduce acertain amount of resistance into the exciter circuit, thereby reducingthe excitation of the generator, hence reducing its magnetic losses. Thegenerator vwill now supply a reduced voltage, but it will be understoodthat the switch 13 moved in unison with the switch 7 and placed aportion of the primary coil into the generator circuit, therebyincreasing the voltage supplied by said generator.

, I am aware that minor changes in the operation of my system can bemade without in the least departing from the nature and principle of myinvention.

I claim:

1. The herein described method of economically cou trolling theelectrical generation in an alternating gener ator system during reducedloads which consists in reducing the field excitation and raising thevoltage supplied by the generator; substantially as described.

2. The herein described method of economically con trolling theelectrical generation in an alternating genorafor system during reducedloads which consists in reducing the field excitation and simultaneouslyraising the voltage-supplied by the generator; substantially asdescribed.

3. The herein described method of economically con trolling theelectrical generation inan alternating gencrator system during reducedloads, which consists in ad iusl ing the excitation of the generatorlleld to decrease the magnetic losses in said generator and adjustingthe out; put of a voltage raising device in the generator circuit tomaintain a predetermined voltage in said circuit; sub stantially asdescribed.

4. The herein described method of economically controlling theelectrical generation in an alternating genera tor system during reducedloads, which consists in adjusting the excitation of the generator lieldto decrease the magnetic losses in said generator and simultaneouslyadjusting the output oi; a voltage raising device in the generatorcircuit to maintain a predcteriirined voltage in said circuit;substantially as described.

5. The herein described method of economically controlling theelectrical generation in an alternating generator system during reducedloads, which consists in de creasing the field excitation and adjustingthe output of: a transformer in the generator supply circuit to maintaina predetermined voltage in said circuit; substantially as described.

6. The herein described method of economically controlling the output ofalternating generators, which consists in transmitting to thegenerator-line a current from a voltage-raising device and of highervoltage than the supply, then adjusting the voltage thus supplied to theline during reduced loads to keep the line voltage constant andsinmltaneously varying the alternator excitation, whereby the generatormay operate at the greatest possible economy under the existing load,andcutting out the voltage raising device and permitting the generatorto feed directly into the line when the load becomes such that the useof the voltage raising device will no longer affect the economy,substantially as described.

7. The herein described method of economically controlling the output ofalternating-generators, which consists in transmitting to thegenerator-line a current from a voltage-raising device and of highervoltage thanthe supply, then adjusting the voltage thus supplied to theline during reduced loads to keep the line voltage constant andsimultaneously varying the alternator excitation, whereby the generatormay operate at the greatest possible economy under the existing load,and alternately cutting out and cutting in the voltage raising device inaccordance with the load carried by the generator, substantially asdescribed.

8. The herein described method of economically controlling theelectrical generation in an alternating generator system, which consistsin raising the voltage supplied by the generator during reduced loads soas to allow the Iield excitation to be reduced to permit operation atgreater economy, and disconnecting the voltage raising device andallowing the generator to feed directly into the line when the use ofsaid device does not effect an economy; substantially as described.

0. The herein described method of economically controlling theelectrical generation in an alternating generator svstem which duringreduced loads consists in decre ng the hold excitation of the generator,and ad justing the output of a voltage raising device in the gen eratorsupply circuit to maintain a predetermined voltage in said circuit andwhen the generator is operating under full load increasing the fieldexcitation to its normal value also disconnecting the voltage raisingdevice from the generator circuit; substantially as described.

10. The herein described method of economically controlling theelectrical generation in an alternating genera tor system which duringreduced loads consists in decreasing the field excitation of thegenerator, and simul taneously adjusting the output of a voltage raisingde vice in the generator supply circuit to maintain a predeterminedvoltage in said circuit and when the generator is operating under fullload increasing the field excitation to its normal value alsodisconnecting the voltage raising device from the generator circuit;substantially as described.

in testimony whereof, I have signed my name to this specification, inthe presence oi? two subscribing witness.

.l'Ol ll'l C. Sl'AlItlll'lfl lll.

Witnesses M. G. IRION,

Amman I A. EICKS.

